Eddy-Current Induced Magnetic Separation of Nonferrous Metals from Solid Wastes

The increasing demand for nonferrous metals in China made the recycle of metallic values such as copper and aluminum metals from solid wastes a prospective resource for nonferrous metals. Eddy-current induced magnetic separation as a friendly separation method may be effectively applied for the separation of nonferrous metals from solid wastes. In the present investigation, a pilot-scale eddy-current induced magnetic separator and its separation procedure was briefly introduced, and the magnetic force acted upon a metal ring is theoretically calculated; on the basis of the calculation of magnetic force, the effects of two key operational parameters, i.e., conductivity/density ratio of metals and frequency of alternative magnetic field, on the separation performance of the pilot-scale magnetic separator were investigated. The results of investigation indicate that the eddy-current induced magnetic separation is effective for the recycle of nonferrous metals from solid wastes.

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Magnetic Separation Research: A Survey of Some Activities in The Netherlands

Magnetic Separation News ◽

10.1155/1984/39671 ◽

1984 ◽

Vol 1 (3) ◽

pp. 123-138

Author(s):

C. B. W. Kerkdijk ◽

R. P. A. R. van Kleef ◽

J. A. Roeterdink

Keyword(s):

Magnetic Separation ◽

Superconducting Magnets ◽

Pilot Scale ◽

Energy Research ◽

Auxiliary Equipment ◽

Magnetic Separator ◽

High Gradient Magnetic Separation ◽

Coal Cleaning ◽

Research Organisations ◽

The University

A survey of magnetic separation research at FDO Engineering consultants, the University of Nijmegen, and the Energy Research Foundation (ECN) will be given.FDO efforts were primarily on coal cleaning using the high gradient magnetic separation (HGMS) technique. The Institute for Materials of the University of Nijmegen performs fundamental studies on magnetic flocculation. A continuous flow magnetic separator is briefly described. The Energy Research Foundation has built and operates an HGMS–system with superconducting magnets. Auxiliary equipment enables the execution of well controlled HGMS pilot scale tests.Intensive contacts and cooperation exist between scientists of the 3 research organisations, and with other industries which are interested in magnetic separation applications.

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Investigation of the effect of several parameters on the applicability of magnetic separation method

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu ◽

10.33271/nvngu/2021-4/069 ◽

2021 ◽

pp. 69-73

Author(s):

Tariq Al-Azab ◽

Jamil Haddad ◽

Fadi Alfaqs

Keyword(s):

Magnetic Separation ◽

Centrifugal Force ◽

Magnetic Force ◽

Separation Efficiency ◽

Industrial Applications ◽

Separation Process ◽

Silica Sand ◽

Sand Particle ◽

Roll Speed ◽

Magnetic Separator

Purpose. This research investigates the separation process performed by a magnetic separator. The magnetic separation process is used to isolate ferrous materials from those which are not. Hence, a prototype of a dry magnetic separator is designed. It should be said that this study defines the effect of different parameters (roll speed, magnetic force, and mass of silica sand particle) on separation efficiency. Methodology. The influence of several parameters of the magnetic separator such as magnetic force, centrifugal force, and properties of particle (mass, shape, etc.) were studied theoretically and simulated by SolidWorks software. The optimum conditions of the magnetic separator were obtained, and several trials were performed to find the point that results in a lower effect of roller speed and a higher effect of the magnetic force on the particle in order to achieve higher separating efficiency. Findings. The results show that the centrifugal force are the most important variable influencing separating efficiency. Moreover, it was found that blade angle magnitude of (174) degree with magnetic force between (1.71E-05 to 6.3E-05 N) and roll speed from (84 to 105 rpm) are the optimum separating conditions to reach higher rate of the separating process. Originality. This is the first time that the effect of the gap distance between the magnet and the feeding particles on the magnetic force has been studied. Furthermore, the effect of centrifugal force on magnetic separator force is investigated theoretically and numerically in order to be compared for different parameters. Practical value. The new prototype design of the magnetic separating unit is promising and efficient since the parameters can be varied based on the type and characteristics of materials. It is also revealed that separating time of the materials is reduced. Hence, this type of construction of a magnetic separator is recommended for industrial applications.

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Centrifugal High Gradient Magnetic Separation of Fine Ilmenite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3304 ◽

2013 ◽

Vol 634-638 ◽

pp. 3304-3307

Author(s):

Lu Zheng Chen ◽

Guo Dong Xu ◽

Jian Xiong Huang ◽

Shu Ming Wen

Keyword(s):

Magnetic Separation ◽

Magnetic Induction ◽

Rotation Speed ◽

Pilot Scale ◽

Separation Performance ◽

High Gradient Magnetic Separation ◽

High Gradient ◽

Concentrate Grade ◽

Two Parameters

Centrifugal High Gradient Magnetic Separation (CHGMS) was creatively developed, and in the present investigation was used for the concentration of fine ilmenite from tailings through a cyclic pilot-scale CHGMS separator, to study the effect of two key parameters, i.e., magnetic induction and rotation speed of matrix, on the separation performance of the separator. The results of investigation indicates that the CHGMS is effective in concentrating the ilmenite; an increase in the rotation speed increases concentrate grade but reduces recovery of TiO2, and this is reverse for the induction. While the two parameters were optimized, a concentrate assaying 19.42% TiO2 with 80.72% recovery of TiO2 is achievable from the tailings assaying 8.18% TiO2. It was concluded that the CHGMS provides a prospective technology for the concentration of fine ilmenite.

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Shape identification in a magnetic separation system

Facta universitatis - series Electronics and Energetics ◽

10.2298/fuee1002159i ◽

2010 ◽

Vol 23 (2) ◽

pp. 159-167

Author(s):

Ilona Iatcheva ◽

Rumena Stancheva ◽

Georgi Kunov ◽

Irish Jordanian

Keyword(s):

Magnetic Separation ◽

Magnetic Force ◽

Identification Problem ◽

Separation Process ◽

Specific Force ◽

Separation System ◽

Shape Identification ◽

Magnetic Separator ◽

Working Zone ◽

The Magnetic Field

The present paper deals with a problem of shape identification in a magnetic separation system, used for separation of useful metal pieces from waste materials. The aim is to increase the productiveness of separation process. The effectiveness of the magnetic separator work is estimated on the basis of specific magnetic force, acting in the working zone of the device. This specific force depends on the magnetic field strength and its gradient. The forward problem of electromagnetic field determination has been solved using finite element method and Quickened 5.6 software package. The specific force determination and solution of the identification problem is realized in MATLOW.

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Effect of Rod Arrangement in Matrix on High Gradient Magnetic Separation Performance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3351 ◽

2013 ◽

Vol 634-638 ◽

pp. 3351-3354 ◽

Cited By ~ 3

Author(s):

Lu Zheng Chen ◽

Guo Dong Xu ◽

Shu Ming Wen ◽

Si Qing Liu ◽

Li Kun Gao

Keyword(s):

Magnetic Separation ◽

Magnetic Induction ◽

Pilot Scale ◽

Superior Performance ◽

Separation Performance ◽

Collision Efficiency ◽

High Gradient Magnetic Separation ◽

High Gradient ◽

Magnetic Elements ◽

The Matrix

The effect of rod arrangement in a rod matrix on high gradient magnetic separation (HGMS) performance has been comparatively investigated through a cyclic pilot-scale centrifugal HGMS separator, with contiguously and orthogonally arranged rod matrixes respectively. The results of investigation indicate that the arrangement of rod elements in the matrix has a distinct effect on the HGMS performance, for relatively low magnetic inductions; beyond the threshold magnetic induction, the magnetic induction dominates that of the arrangement and the importance of the arrangement is significantly weakened even vanished. It was thus concluded that the combinatorial optimization for magnetic elements in the matrix improves the collision efficiency of particles with matrix, and gives a superior performance in a HGMS separator, at a lower energizing consumption.

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Investigation of the magnetic separation performance of a low-intensity magnetic separator embedded with auxiliary permanent magnets

Minerals Engineering ◽

10.1016/j.mineng.2022.107399 ◽

2022 ◽

Vol 178 ◽

pp. 107399

Author(s):

Feiwang Wang ◽

Shitao Zhang ◽

Zhiqiang Zhao ◽

Likun Gao ◽

Xiong Tong ◽

...

Keyword(s):

Magnetic Separation ◽

Permanent Magnets ◽

Separation Performance ◽

Magnetic Separator ◽

Low Intensity

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Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study

Minerals ◽

10.3390/min11020150 ◽

2021 ◽

Vol 11 (2) ◽

pp. 150

Author(s):

Sharath Kumar Bhoja ◽

Sunil Kumar Tripathy ◽

Yanamandra Rama Murthy ◽

Tamal Kanti Ghosh ◽

C. Raghu Kumar ◽

...

Keyword(s):

Magnetic Separation ◽

Separation Performance ◽

Gangue Mineral ◽

Manganese Ore ◽

Magnetic Separator ◽

Dry Magnetic Separation ◽

Mn Recovery ◽

Optimum Grade ◽

Iron Bearing ◽

Iron And Manganese

Magnetic separation is often considered pertinent for manganese ore beneficiation when the ore is abundant with siliceous rich gangue mineral phases. However, the process is deemed to be inapposite for the ferruginous type of ore, and remains a grey area of research. In the present investigation, two different types of manganese ore were studied in detail to understand the influence of mineralogy on their magnetic separation performance. Detailed experiments were performed by varying the critical variables of the dry magnetic separator, and the separation features were studied. The ore samples were thoroughly characterized by various techniques, including an automated advanced mineralogical tool. The mineralogical results revealed that primary manganese bearing minerals in both the ores are rich in cryptomelene, pyrolusite, psilomelane, and bixybyite. Similarly, the major gangue minerals were alumina-bearing minerals and iron-bearing phases (hematite and goethite). The optimum grade that could be obtained from single-stage dry magnetic separation was 35.52% Mn, and with a Mn:Fe ratio of 1.77, and 44% Mn recovery in the case of sample 1; whereas, a 33.75% Mn grade, with a Mn:Fe ratio of 1.66 at Mn recovery of 44% was reported for Sample 2. It was observed that both samples had a similar input chemistry (~28% Mn, ~1 Mn: Fe ratio) however, they had distinctive mineralogical assemblages. Furthermore, it was observed that the liberation of manganese mineral was in a course size range, i.e., 300 to 450 µm, while the association of iron and manganese bearing phases was lower in sample 1 when compared to sample 2.

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Enrichment of a Nigerian chromite ore for metallurgical application by dense medium flotation and magnetic separation

Metallurgical Research & Technology ◽

10.1051/metal/2018097 ◽

2019 ◽

Vol 116 (3) ◽

pp. 324 ◽

Cited By ~ 1

Author(s):

Kuranga Ibrahim Ayinla ◽

Alafara Abdullahi Baba ◽

Bankim Chandra Tripathy ◽

Malay Kumar Ghosh ◽

Rajan Kumar Dwari ◽

...

Keyword(s):

Particle Size ◽

Magnetic Separation ◽

Organic Liquid ◽

Size Fraction ◽

Dense Medium ◽

Chromium Alloy ◽

Magnetic Separator ◽

Electro Deposition ◽

Chromite Ore ◽

Wet Chemical

This study, focused on the beneficiation of a Nigerian complex chromite ore sourced from Tunga-Kaduka, Anka Local Government of Zamfara State, Nigeria, assaying 45.85% Cr2O4 and 54.15% mineral impurities, was enriched concurrently through sink floatation and magnetic separation techniques. The chromite ore initially analyzed to contain silicate impurities was found not suitable for metallurgical purposes. Thus, enrichment was examined through gravity separation studies using organic liquid with different specific gravities at 2.8, 3.3, and 4.0. The separation of chromite ore with lowest particle size fraction was done using Mozley mineral separator followed by the magnetic separation of the sink product by magnetic separator. The results obtained revealed about 77% of the total material containing 300 μm particle size, 52% ˂ 212 μm and 17% below 75 μm. Subsequent analysis of the beneficiated ore was carried out by wet chemical analysis and atomic absorption spectrophotometer. The results showed that Cr2O4 content increased to 78.34% from initial 45.83% with maximum Cr:Fe ratio of 3.2:1, representing 84.27% of chromium metal present in the ore. The enrichment of Cr2O4 obtained in this study could be found metallurgically applicable in the electro-deposition and ferro-chromium alloy production practices.

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